CN112649109B - Device and method for judging running state of radiating fan of frequency converter - Google Patents
Device and method for judging running state of radiating fan of frequency converter Download PDFInfo
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- CN112649109B CN112649109B CN202011528612.XA CN202011528612A CN112649109B CN 112649109 B CN112649109 B CN 112649109B CN 202011528612 A CN202011528612 A CN 202011528612A CN 112649109 B CN112649109 B CN 112649109B
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- frequency converter
- gear
- temperature
- fan
- control microcomputer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
Abstract
The invention discloses a device and a method for judging the running state of a radiating fan of a frequency converter, which are used for an elevator frequency converter, the running state of the radiating fan of the frequency converter is monitored in real time through an NTC (negative temperature coefficient) resistor arranged in a power module of the frequency converter, fault information can be monitored when one or more faults of the radiating fan occur, the diagnosis of the running working condition of the radiating fan of the frequency converter is facilitated, maintenance personnel are informed in advance to carry out maintenance, the generation of elevator faults is avoided, the reliability of the elevator in the use process is improved, meanwhile, the elevator stops nearby layers under the condition that the radiating fan is totally damaged, the power module is protected from being burnt out due to overheating, and the trouble of people trapping is avoided; the main control microcomputer is adopted to monitor the running state of the fan of the frequency converter in real time without increasing the cost, and the product competitiveness is improved.
Description
Technical Field
The invention relates to the technical field of elevator frequency converters, in particular to a device and a method for judging the running state of a radiating fan of a frequency converter.
Background
The protection function of the heat radiation fan body of the elevator frequency converter is overload protection, power polarity protection, locked rotor protection and the like. However, when the cooling fan is used as a cooling fan of an elevator frequency converter, the operation state of the cooling fan is not well judged. During field application, after radiator fan breaks down, can discover only after arousing the overheated trouble of converter, this can arouse converter power module to burn out because of overheated, and then leads to the elevator to stop operation, can cause the elevator to be stranded or the adverse effect that the elevator stopped service.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a device and a method for judging the running state of a fan of a frequency converter, which can detect a fault signal when a heat radiation fan of the frequency converter of an elevator fails, are favorable for diagnosing the running working condition of the heat radiation fan of the frequency converter, inform maintenance personnel in advance to maintain, avoid the generation of elevator faults, improve the reliability, avoid the increase of cost in a microcomputer program scheme, and improve the product competitiveness.
The invention is realized by the following technical scheme:
a device for judging the running state of a radiating fan of a frequency converter comprises:
the frequency converter unit comprises a power module with a built-in NTC thermosensitive temperature measuring resistor, a radiator and a cooling fan; the power module is arranged on the radiator, and the heat radiation fan provides forced air cooling heat radiation conditions for the radiator;
the temperature acquisition unit consists of a digital-to-analog conversion circuit; and
the control unit is a main control microcomputer; and the signals acquired by the temperature acquisition unit are transmitted to a main control electronic board of the control unit.
Further, a method for judging the operation state of a cooling fan of a frequency converter comprises the following steps: an NTC temperature-sensing resistor arranged in the power module collects the temperature Tc of the surface of a radiator in a radiating system of the frequency converter, the real-time temperature of the surface of the radiator can be calculated by a digital-to-analog conversion circuit and the following formula, the real-time temperature is transmitted to a main control microcomputer in an analog quantity mode, and the temperature of the radiating system is monitored in real time and used as basic data;
setting the resistance value of an NTC resistor between T1 and T2 as Rx, and setting T = 25-50 ℃; the resistor R1 is connected with the resistor R2 in series; the resistor R1 is connected with the resistor R3 in parallel;
rx = R EXP (B (1/T1-1/T2)); wherein, B is the temperature coefficient of the NTC resistor;
when R1= R2=10k, R3=1k,
and calculating the real-time temperature Vo =5 × 11 RT/(12Rx + 10K).
Furthermore, temperature curve data collected when a frequency converter heat dissipation system works in a development stage is utilized as reference data in a main control microcomputer, and operation temperature curves when a heat dissipation fan is fully put into operation, is half put into operation and is not put into operation are set, and gears of the temperature curves are A gear, B gear and C gear respectively; the gear A, the gear B and the gear C respectively correspond to the good gear, the half-damage gear and the full-damage gear of the operation condition of the cooling fan.
Furthermore, the basic data and the reference data are compared in real time in the main control microcomputer, the state of the heat dissipation system of the frequency converter is detected in real time, and the fault level is detected in real time.
Further, when the master control microcomputer monitors that the operating state gear of the cooling fan is semi-damaged, corresponding fault display is output, the elevator with a lower fault level is normally put into operation, and the fault code is interpreted as: one or more of the heat dissipation fans are damaged, or dust is accumulated on the heat dissipation fans and the heat radiator, so that the maintenance is required as soon as possible.
Further, when the master control microcomputer monitors that the operating condition gears of the cooling fan are completely damaged, the elevator stops on the layer close to the elevator, the door is kept opened, passengers are enabled to stop service after leaving the elevator, the frequency converter power module is protected from being burnt out due to overheating, and meanwhile, high-level fault indication is as follows: and replacing the radiating fan of the frequency converter.
Furthermore, the main control microcomputer monitors the gear position of the temperature curve after being electrified again each time, and judges whether the frequency converter unit can be put into use.
The invention has the beneficial effects that:
according to the invention, the running condition of the heat radiation fan of the frequency converter is monitored in real time through the NTC resistor arranged in the power module of the frequency converter, fault information can be monitored when one or more faults occur in the heat radiation fan, the diagnosis of the running working condition of the heat radiation fan of the frequency converter is facilitated, maintenance personnel are informed in advance to carry out maintenance, the generation of elevator faults is avoided, the reliability of the elevator in the using process is improved, meanwhile, under the condition that the heat radiation fan is completely damaged, the elevator stops nearby layers, the power module is protected from being burnt out due to overheating, and the trouble of people trapped is avoided; the main control microcomputer is adopted to monitor the running state of the fan of the frequency converter in real time without increasing the cost, and the product competitiveness is improved.
Drawings
FIG. 1 is a graph of temperature curves collected during operation of a heat dissipation system utilizing a development phase inverter in a main control microcomputer according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a circuit structure of a temperature acquisition unit according to an embodiment of the present invention;
FIG. 3 is a temperature curve diagram of an NTC thermistor according to an embodiment of the present invention;
FIG. 4 is a table of data of resistance values as a function of temperature according to an embodiment of the present invention.
Detailed Description
The invention will be described in detail with reference to the drawings and specific embodiments, which are illustrative of the invention and are not to be construed as limiting the invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, back, upper end, lower end, top, bottom … …) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In the present invention, unless expressly stated or limited otherwise, the term "coupled" is to be interpreted broadly, e.g., "coupled" may be fixedly coupled, detachably coupled, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, descriptions such as "first", "second", etc. in the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature; in addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
A device for judging the running state of a radiating fan of a frequency converter comprises:
the frequency converter unit comprises a power module with a built-in NTC thermosensitive temperature measuring resistor, a radiator and a cooling fan; the power module is arranged on the radiator, and the heat radiation fan provides forced air cooling heat radiation conditions for the radiator;
the temperature acquisition unit consists of a digital-to-analog conversion circuit; and
the control unit is a main control microcomputer; and the signals acquired by the temperature acquisition unit are transmitted to a main control electronic board of the control unit.
Specifically, in the solution of this embodiment, as shown in fig. 1 to fig. 3, a method for determining an operating state of a heat dissipation fan of an inverter includes: an NTC temperature-sensing resistor arranged in the power module collects the temperature Tc of the surface of a radiator in a radiating system of the frequency converter, the real-time temperature of the surface of the radiator can be calculated by a digital-to-analog conversion circuit and the following formula, the real-time temperature is transmitted to a main control microcomputer in an analog quantity mode, and the temperature of the radiating system is monitored in real time and used as basic data;
setting the resistance value of an NTC resistor between T1 and T2 as Rx, and setting T = 25-50 ℃; the resistor R1 is connected with the resistor R2 in series; the resistor R1 is connected with the resistor R3 in parallel; refer to fig. 2 and 4;
rx = R EXP (B (1/T1-1/T2)); wherein, B is the temperature coefficient of the NTC resistor;
when R1= R2=10k, R3=1k,
and calculating the real-time temperature Vo =5 × 11 RT/(12Rx + 10K).
Specifically, in the scheme of this embodiment, temperature curve data collected when the frequency converter cooling system works in the development stage is used as reference data in the main control microcomputer, and operating temperature curves when the cooling fan is fully put into, half put into and not put into work are set, and the gears of the temperature curves are respectively an a gear, a B gear and a C gear; the gear A, the gear B and the gear C respectively correspond to the good gear, the half-damage gear and the full-damage gear of the operation condition of the cooling fan.
Specifically, in the embodiment, the basic data and the reference data are compared in real time in the main control microcomputer, the state of the heat dissipation system of the frequency converter is detected in real time, and the fault level is detected in real time.
Specifically, in the embodiment, when the main control microcomputer monitors that the operating condition gear of the cooling fan is half damaged, the corresponding fault display is output, at this time, the elevator with a lower fault level is normally put into operation, and the fault code is interpreted as: if one or more of the heat dissipation fans are damaged or dust is accumulated on the heat dissipation fans and the heat sink, the maintenance is required as soon as possible.
Specifically, in this embodiment scheme, when master control microcomputer monitors that radiator fan operation status gear is the total damage, the elevator stops the ladder with regard to nearly layer to keep opening the door, let the passenger leave the elevator and stop service, protection converter power module avoids overheated burnout, and high-grade fault indication is simultaneously: and replacing the radiating fan of the frequency converter.
Specifically, in the embodiment, the main control microcomputer monitors which gear the temperature curve is in after being powered on again each time, and determines whether the frequency converter unit can be put into use.
According to the invention, the running condition of the cooling fan of the frequency converter is monitored in real time through the NTC resistor arranged in the power module of the frequency converter, fault information can be monitored when one or more faults of the cooling fan occur, the diagnosis of the running working condition of the cooling fan of the frequency converter is facilitated, maintenance personnel are informed to maintain in advance, the generation of elevator faults is avoided, the reliability of the elevator in the using process is improved, meanwhile, under the condition that the cooling fan is totally damaged, the elevator stops at a nearby layer, the power module is protected from being burnt out due to overheating, and the trouble caused by people is avoided; the main control microcomputer is adopted to monitor the running state of the fan of the frequency converter in real time without increasing the cost, and the product competitiveness is improved.
The technical solutions provided by the embodiments of the present invention are described in detail above, and specific examples are applied herein to explain the principles and embodiments of the present invention, and the descriptions of the embodiments above are only used to help understanding the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the present description should not be construed as a limitation to the present invention.
Claims (5)
1. A method for judging the running state of a radiating fan of a frequency converter is characterized by comprising the following steps: an NTC temperature-sensing resistor arranged in the power module collects the temperature Tc of the surface of a radiator in a radiating system of the frequency converter, transmits the temperature of the surface of the radiator to a main control microcomputer in an analog quantity mode through a digital-to-analog conversion circuit, and monitors the temperature of the radiating system in real time to serve as basic data; the method comprises the following steps that temperature curve data collected when a frequency converter heat dissipation system works in a development stage are utilized as reference data in a main control microcomputer, operation temperature curves of a heat dissipation fan when the heat dissipation fan is fully put into operation, half put into operation and fully not put into operation are set, and gears of the temperature curves are A gear, B gear and C gear respectively; the gear A, the gear B and the gear C respectively correspond to the good gear, the half-damage gear and the full-damage gear of the operation condition of the cooling fan; and comparing the basic data with the reference data in real time in the main control microcomputer, detecting the state of the heat dissipation system of the frequency converter in real time, and detecting the fault level in real time.
2. The method for judging the operating state of the cooling fan of the frequency converter according to claim 1, wherein: when the master control microcomputer monitors that the operating state gear of the cooling fan is semi-damaged, corresponding fault display is output, the elevator with lower fault level is normally put into operation at the moment, and the fault code is interpreted as: one or more of the heat dissipation fans are damaged, or dust is accumulated on the heat dissipation fans and the heat radiator, so that the maintenance is required as soon as possible.
3. The method for judging the operating state of the cooling fan of the frequency converter according to claim 1, wherein: when the master control microcomputer monitors that the operating condition gears of the cooling fan are completely damaged, the elevator stops on the near-layer, the door is kept opened, the passenger stops serving after leaving the elevator, the frequency converter power module is protected from being burnt out due to overheating, and meanwhile, the high-level fault indication is as follows: and replacing the radiating fan of the frequency converter.
4. The method for judging the operating state of the cooling fan of the frequency converter according to claim 1, wherein: the main control microcomputer monitors the gear position of the temperature curve after being electrified again every time, and judges whether the frequency converter unit can be put into use.
5. The method for judging the operating state of the cooling fan of the frequency converter according to any one of claims 1 to 4, characterized by further comprising a judging device, wherein the judging device comprises:
the frequency converter unit comprises a power module with a built-in NTC thermosensitive temperature measuring resistor, a radiator and a cooling fan; the power module is arranged on the radiator, and the heat radiation fan provides forced air cooling heat radiation conditions for the radiator;
the temperature acquisition unit consists of a digital-to-analog conversion circuit; and
the control unit is a main control microcomputer; and the signals acquired by the temperature acquisition unit are transmitted to a main control electronic board of the control unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011528612.XA CN112649109B (en) | 2020-12-22 | 2020-12-22 | Device and method for judging running state of radiating fan of frequency converter |
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| CN202011528612.XA CN112649109B (en) | 2020-12-22 | 2020-12-22 | Device and method for judging running state of radiating fan of frequency converter |
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| CN112649109B true CN112649109B (en) | 2023-03-17 |
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| CN117347772B (en) * | 2023-12-04 | 2024-03-26 | 深圳市铭瑞达五金制品有限公司 | Fault monitoring system and method for graphene radiator |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1812705A (en) * | 2005-01-24 | 2006-08-02 | 大众电脑股份有限公司 | Control system and method for fan of electronic device and radiating system thereof |
| CN103699152A (en) * | 2013-11-28 | 2014-04-02 | 中冶南方（武汉）自动化有限公司 | Power device over-temperature protection method based on temperature curve slope control |
| CN110880485A (en) * | 2019-11-29 | 2020-03-13 | 上海道之科技有限公司 | High-power-density integrated packaging module |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102007005571B4 (en) * | 2007-02-05 | 2022-07-07 | Robert Bosch Gmbh | Increased availability fan assembly and method of its operation |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1812705A (en) * | 2005-01-24 | 2006-08-02 | 大众电脑股份有限公司 | Control system and method for fan of electronic device and radiating system thereof |
| CN103699152A (en) * | 2013-11-28 | 2014-04-02 | 中冶南方（武汉）自动化有限公司 | Power device over-temperature protection method based on temperature curve slope control |
| CN110880485A (en) * | 2019-11-29 | 2020-03-13 | 上海道之科技有限公司 | High-power-density integrated packaging module |
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